I found a good banh mi in Olympia, at Little Da Nang restaurant, 301 W. 4th Ave.
Chicken, pork or veggie sandwiches are $2.99, take-out only.
The wait for a made-to-order sandwich took a bit long. But the payoff was pleasing: roasted pork inside a soft baguette with mayo, cucumbers, carrots, cilantro and lettuce. I asked for jalapenos but they got left out in the translation.